Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
One of final targets of solar to hydrogen conversion is the energy storage for solar to electric power conversion. This main reason to use the energy storage is that the solar power fluctuation is not fit to the user-on-demand life style. One of the ways for energy storge is direct conversion like solar fuel by using photoelectrochemical or electrochemical methods. This direct conversion is clear and simple, but is difficult to use as the main measures to supress the electric power fluctuation of the electric power generateed by solar cell. Especially for the small sized system like a few to a few tens kW power output, the combination of the electric power generation by solar cell and hydrogen generation by water splitting is one of the suitable methods for the user-on-demand system.
We have studied the energy system with water split hydrogen storage. The main problem of this system is not only its low energy conversion efficiency but also the difficulty of user on demand system operation. The system operation looks very simple because the electric power is simply split or merge [1]. However, the operation voltage of water splitting cell requires electric voltage changing to control the amount of hydrogen generation, and the output voltage of fuel cell changes depending on the power output. As a result, sensitive control to split and merge of electric power is required for achieving the user-on-demand energy system with voltage changing. This control is usully performed by the input and output of all devices control by CPU. We achieved this control by using the voltage control of DC bus line of the system without using “so called” this CPU. This control is a kind of “DC bus signaling” and is achieved self-controlling.
[1] K. Fujii et al., Mater. Res. Symp. Proc., 1491 (2013) DOI: 10.1557/opl.2012.1739.
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